the notion that trinitarians are growing spiritually and unitarians are not is simply silly - and contrary to all facts.
I can't blame you for coming to that conclusion since I wasn't explicit; being a trinitarian DOES NOT mean you're automatically spiritually maturing (quite the contrary). For example the trinitarians that believe in works salvation are not growing spiritually
. The unitarians who believe Christ is not God are also
not growing spiritually.
This is because both groups
are not utilizing 1 John 1:9 -- so you can never rehabilitate (rescue) your thinking via James 1:21. And the mechanics of the GOD-MAN being the mediator are only possible if Christ is God. It's one of the many reasons why Roman Catholicism contorts men into being mediators instead of Jesus Christ. Likewise unitarianism converts Jesus Christ into a man to nullify Him as a mediator as well... so in both cases you can't
get Christ's thinking, and instead rely on your own intuition.
Relying on human intuition (not doing 1 John 1:9) means that you'll hallucinate that you are spiritually mature with emotion, but you'll never learn what God wants you to know. So these people never get into the 'big topics'. If ANY Christian is stuck at salvation or the trinity, they simply WON'T have the capacity for advanced bible doctrine. I know you won't agree with that since you're on the unitarian position, but that's the conclusion I came to after spending two years studying the doctrine of salvation (which is BELIEF + 0). In other words, believe only and nothing else.
There are always exceptions to a rule; but belief + 0 and the GOD-MAN come up in so many doctrines that if you're adverse to them, it'll make everything nonsensical. It all has to fit.